Even if you are not aware, every presentation you create has its own Slide Master. This Master governs the default attributes like slide background, font choices, colors, and even the positioning of the placeholders in your slide. Thus if you end up with a 50 slide presentation that uses center aligned titles that you want changed to left aligned titles in a larger font size — then you need to make this change only once within the Slide Master, and all 50 slides update at once with your new Title formatting! Also, the icing on the cake is that you do not have to format individual slides – this saves you loads of time, and you also end up with slides that are consistent in look.
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